# US 2019/0169929 A1 · Pull cord arrangement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0169929 A1 - Document ID: US20190169929A1 - Status: Published application - Kind: A1 - Application number: 16/313,562 - Filed: 2017-06-28 - Published: 2019-06-06 - Earliest claimed: 2016-07-01 - Assignees: IKEA Supply AG - Applicants: Ikea Supply AG - Inventors: Bo ZHANG - Web page: https://patentgrep.com/patent/US20190169929A1 ## CPC - E06B 9/78: for direct manual operation, e.g. by tassels, by handles - E06B 9/326: Details of cords, e.g. buckles, drawing knobs - E06B 9/42: Parts or details of roller blinds, e.g. suspension devices, blind boxes (brackets or adjustable mountings for roller blinds and drawable curtains A47H1/13) - E06B 9/60: Spring drums operated only by closure members - E06B 2009/3265: {Emergency release to prevent strangulation or excessive load} - E06B 2009/785: {by belts, straps, bands, tapes, cords, tassels} - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) ## Abstract The invention refers to a pull cord arrangement for a roller blind or a venetian blind, comprising a winding element (4) arranged to be connected to a blind (6) such that the blind (6) is released or wound in response to a rotational movement of the winding element (4) about a rotational axis; a connecting element (28) coupled to the winding element (4) to rotate together with the winding element (4); and a pull cord (50) engaging the connecting element (28) so as to control the rotation of the connecting element (28) and thus the winding element (4) as the pull cord (50) is operated. ## Claims ### Claim 1 Pull cord arrangement for a roller blind or a Venetian blind, comprising a winding element arranged to be connected to a blind such that the blind is released or wound in response to a rotational movement of the winding element about a rotational axis, a connecting element coupled to the winding element to rotate together with the winding element, and a pull cord engaging the connecting element so as to control the rotation of the connecting element and thus the winding element as the pull cord is operated, and wherein the ratio between the engagement diameter d of the connecting element at which diameter the pull cord operatively engages the connecting element and the outer diameter D of the winding element is smaller than 2:3, wherein the pull cord arrangement further comprises a pull cord actuator formed by a telescopic rod comprising a first rod and a second rod, the second rod being movable in relation to the first rod along a longitudinal extension of the first rod, and wherein the pull cord is connected to the second rod, whereby the pull cord is operated by moving the second rod along the longitudinal extension of the first rod, and in that the pull cord in a position along its longitudinal extension comprises a carrier; the first rod along its longitudinal extension comprises a slit in which the carrier of the pull cord is movably received; and the second rod in a surface facing the slit comprises a locking element engaging the carrier, whereby the pull cord is operated as the second rod is moved along the first rod. ### Claim 2 (depends on 1) Pull cord arrangement according to claim 1, wherein the pull cord forms a closed loop and is a bead chain, a toothed belt, a perforated belt or a chain, and wherein the connecting element along its outer circumference as seen transverse the rotational axis comprises projections engaging the pull cord. ### Claim 3 (depends on 1) Pull cord arrangement according to claim 1, wherein the pull cord is received inside the first rod. ### Claim 4 (depends on 1) Pull cord arrangement according to claim 1, wherein the first rod is pivotably arranged about the rotational axis of the winding element. ### Claim 5 (depends on 4) Pull cord arrangement according to claim 4, wherein the first rod encases the connecting element. ### Claim 6 (depends on 1) Pull cord arrangement according to claim 1, wherein the winding element is a tube, the outer envelope surface thereof forming a support onto which the blind of a roller blind is to be wound or a support onto which the strings of the Venetian blind are to be wound. ### Claim 7 (depends on 1) Pull cord arrangement according to claim 1, wherein the winding element comprises a spring providing a rotational biasing of the winding element. ### Claim 8 (depends on 1) Pull cord arrangement according to claim 1, wherein the ratio between the engagement diameter d of the connecting element at which diameter the pull cord operatively engages the connecting element and the outer diameter D of the winding element is smaller than 1:2, more preferred smaller 1:3 and even more preferred smaller than 1:4.